diff --git a/contrib/epee/include/serialization/keyvalue_helpers.h b/contrib/epee/include/serialization/keyvalue_helpers.h
index 9b5f0dcf..d76fc641 100644
--- a/contrib/epee/include/serialization/keyvalue_helpers.h
+++ b/contrib/epee/include/serialization/keyvalue_helpers.h
@@ -105,7 +105,7 @@ namespace epee
     std::string res;
     for (const auto& item : a)
     {
-      res += epee::string_tools::pod_to_hex(a) + ", ";
+      res += epee::string_tools::pod_to_hex(item) + ", ";
     }
     if (a.size())
     {